Samsung is reportedly testing much larger battery options for the Galaxy S27 Ultra, potentially increasing capacity up to 6020mAh. Insider Schrodinger, also known as Phone Futurist, says the company is considering battery sizes ranging from 5600mAh to 6020mAh-significantly above the usual 5200mAh found in prior Ultra models. If finalized, this would mark the biggest battery upgrade for the Ultra series in several generations.

Unlike some Chinese flagship brands that have adopted silicon-carbon anodes to boost battery capacity recently, Samsung aims to extract more power from traditional lithium-ion cells. The company is exploring new Samsung SDI battery cells with denser layouts and higher energy density within the same chemistry, rather than switching to newer battery technologies.

Since the Galaxy S20 Ultra launched, Samsung’s premium Ultra phones have hovered around the 5000mAh mark, relying on power-efficient processors and displays to improve battery life instead of bigger cells. Meanwhile, many Chinese competitors have pushed battery capacities well beyond 6000mAh, with some models hitting 6500-7000mAh without noticeably increasing device thickness.

Galaxy S27 Ultra battery capacity increase compared to previous models

The battery capacity rumors for the Galaxy S27 Ultra indicate the following possible options:

• 5600mAh battery
• 6020mAh battery (largest ever for Samsung Ultra series)
• Compared to 5200mAh in Galaxy S22 Ultra and S23 Ultra

Schrodinger also reported that the Galaxy S27 Pro could feature a smaller 5000mAh battery. This suggests clearer differentiation within the S27 lineup, with the Ultra variant positioned as the top-tier endurance champion. Samsung’s conservative battery and charging approach contrasts with rivals that have moved into fast charging ranges of 80 to 120 watts, while Samsung still caps charging speeds at 45 watts on its flagship models.

Samsung’s battery technology approach versus competitors

Samsung is sticking with traditional lithium-ion chemistry, focusing on Samsung SDI battery cells with denser layouts to increase energy density. This contrasts with Chinese brands like Xiaomi, OnePlus, and Oppo, which have adopted newer battery tech such as silicon-carbon anodes to boost capacity and fast charging speeds reaching 80-120 watts.

Samsung’s Galaxy S27 series is several months away from launch, and the final battery decision will be confirmed during certification stages. If the company chooses to retain the 5200mAh battery, it will continue trailing Chinese flagships on battery capacity for another generation.

Battery capacity trends in the smartphone industry

Since the Galaxy S20 Ultra, Samsung’s Ultra phones have maintained around 5000mAh capacity, balancing battery size with device thickness and thermal management. Chinese competitors have aggressively increased battery capacities beyond 6000mAh without adding bulk.

The Galaxy S27 Ultra’s potential battery upgrade reflects Samsung’s evolving strategy to match competitors’ raw capacity while maintaining device design standards. Observers will be watching how Samsung balances these priorities in its upcoming flagship.